package com.codeyn.utils;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

/**
 * 
 * @author Codeyn
 *
 */
public class HttpUtil {

    /**
     * 获取客户端IP
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        ipAddress = request.getHeader("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }

        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }

        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if (ipAddress.equals("127.0.0.1")) {
                // 根据网卡取本机配置的IP
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress = inet.getHostAddress();
            }
            if (ipAddress.equals("0:0:0:0:0:0:0:1")) {
                ipAddress = "127.0.0.1";
            }
        }

        // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        // "***.***.***.***".length() = 15
        if (ipAddress != null && ipAddress.length() > 15) {
            if (ipAddress.indexOf(",") > 0) {
                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
        }

        return ipAddress;
    }

    public static boolean isAjax(HttpServletRequest request) {
        String xRequestedWith = request.getHeader("X-Requested-With");
        boolean isAjax = request.getHeader("accept").indexOf("application/json") > -1;
        return isAjax || (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") > -1);
    }

}
